临近区间隧道的深基坑开挖过程安全性影响评估研究

Safety impact assessment study of deep foundation excavation process near interval tunnels

以某商务区基坑开挖项目为依托,结合数值仿真软件PLAXIS建立隧道下穿火车站的分析模型,根据拟开挖基坑与既有地铁14号线两站区间隧道结构的相对位置关系,考虑开挖影响范围,研究深基坑开挖施工时引起的北侧地铁14号线两站区间结构及西侧地下交通环廊结构变形。结果表明:某商务区深基坑施工时,地铁14号线区间结构变形相对较小,处于安全预警范围之内;在正常施工条件下,采取一定的轨道防护措施和监测措施,能确保地铁列车安全运行。

This study is based on a pit excavation project in a business district,and utilizes the numerical simulation software PLAXIS to establish an analytical model of the tunnel passing beneath a train station.Taking into consideration the relative position of the planned excavation pit and the existing structures of the interval tunnel between two stations on Subway Line 14,the study investigates the influence range of the excavation,focusing on the induced deformations of the interval structure on the north side of Subway Line 14 and the underground traffic corridor structure on the west side during the deep pit excavation construction.The results indicate that during the construction of the deep pit in the business district,the deformation of the interval structure of Subway Line 14 is relatively minor and remains within the safety warning range.With normal construction conditions,the implementation of certain protective measures for the tracks and monitoring measures can ensure the safe operation of the subway trains.